ES2218956T3 - BOTTOM PRE-HEATING BLOCK FOR USE IN A METAL UNLOADING DEVICE. - Google Patents

Abstract

A lower pre-heat block assembly (9) for use with a metal scarfing apparatus (5) is disclosed. The lower pre-heat block assembly has a lower block (38) and an extension (39) engaged upon and in overlying relationship with a front face (46) of the lower block. A gas discharge outlet (56) is defined within the front face of the block. The extension may partially overlie the gas discharge outlet such that a gas discharge orifice (70) is defined in the front face of the block by the extension. The extension includes an upper face (58) which extends forwardly from the front face of the block, and is recessed with respect to an upper face (41) of the block. So constructed, when a sheet-like oxidizing gas flow (82) is passed over the upper faces of the block and the extension, respectively, and as a fuel gas (85) is emitted through the gas discharge outlet, the fuel gas is pneumatically compressed between the oxidizing gas flow and the upper face of the extension such that the fuel gas is substantially uniformly distributed along the longitudinal length of the lower pre-heat block assembly and forms a uniform sheet-like fuel gas flow (90) which underlies and adjoins the sheet-like oxidizing gas flow so as to prevent ambient air from aspirating into the oxidizing gas flow and thereby result in a smooth and uniformly scarfed surface on the metal workpiece. <IMAGE>

Description

Lower preheating block for your use in a metal deburring apparatus.

Field of the Invention

The invention generally relates to an apparatus Used for thermochemical deburring of work pieces. Plus particularly, the invention relates to a block assembly of Improved lower preheating for use with an appliance this type in which the block set is built and ready to create a flow of laminar gas to protect a separate laminar oxidizing gas flow generated during the process Deburring to achieve a smooth deburring surface on the metal work pieces.

Background of the invention

In the production and finishing of parts of metal work, for example, elongated steel blades, ingots, and bars, the steel is conditioned or finished superficially by creating relative movement between the steel workpiece and a deburring device that has at least one deburring unit arranged along the top, bottom, or side surfaces of the workpiece to eliminate surface defects such as cracks, fissures, slag inclusions, surface oxides, and mechanical defects that result from lamination or casting processes, for example.  A known type of deburring apparatus of this type comprises upper, lower, and opposite side deburring units that they are mounted across the width and extreme areas of the work piece to debur each side of the piece working simultaneously while passing through the device deburring and between the deburring units so arranged.

Each of the top deburring units, side, and bottom of the deburring apparatus comprises a tube multiple and a header set constructed and arranged for receive and distribute both oxygen and combustible gas to preheating blocks opposite upper and lower or to the sets of blocks arranged forming a part of each of such deburring units. Preheating blocks respective upper or lower are distanced from each other to define an oxygen groove that burrs between them, and through which passes a quantity of oxygen under pressure and directed towards the work piece to allow the deburring process to happen thermochemical The lower preheating block will comprise typically a fuel gas channel having an opening of discharge arranged adjacent to the oxygen groove formed by the upper and lower preheating blocks to discharge a combustible gas adjacent to the oxygen flow for the purpose that it maintains the oxidation reaction on the surface of the work piece, and also to protect the oxygen flow of the aspiration, for example, of mixing with the air of environment, which tends to decrease the effectiveness of the process of thermochemical deburring.

An example of a known type of lower preheating block such as this is disclosed in US Patent No. 2 838 431 of Allmang et al ., In which the preheating block is revealed as being constructed in one piece and comprising a series of spaced fuel gas outlets that extend from side to side the width of the front face of the block. The combustible gas is distributed to the inlet ports through a number of laterally spaced fuel gas lines extending from the rear face of the block to a transverse internal perforation placed just behind, and in communication with, the ends interiors of the exit ports. An elongated dividing bar, or bar, comprising a number of spaced apart transverse discs is disposed within the perforation so that it divides the perforation into a series of uniform gas distribution chambers. The ends of the perforation are closed with sealed ends in a known manner.

While the fuel gas outlet ports defined on the front face of the lower preheating block of Allmang et al was an improvement over the deburring machines then known, because the fuel gas ports were spaced very close to each other with respect to to the others, due to the effort to prevent the escape of air from the aspiration with the oxidizing gas stream, the problem still remained because the outside air tended to be dragged to and between the exit ports of the combustible gas in such a way that outside air used to be aspirated with the flow of oxidizing gas.

As is known to those skilled in the art, the shield of the oxygen laminar stream, or the flow of oxidizing gas created when oxygen has passed between the upper and lower preheating blocks is more critical for a smooth deburring surface to be produced. in the workpiece that is being deburred as a variation or inconsistency in the fuel gas flame of the lower preheating block that may cause a variation in the deburred surface. Any variation of this type can lead to a non-uniform extraction of metal, which results in ridges and valleys, so that the deburring depth must be increased so that these ridges and valleys can be extracted, for example, must be extracted a sufficient amount of the surface of the object to provide for the extraction of all surface defects of this type that exist prior to the deburring process, as well as those that have been caused in the deburring process. As a result, the Allmang et al deburring apparatus of similar construction, leads to the extraction of an excess of metal, on the contrary causing the extraction of metal that is satisfactory which increases the yield losses during the finishing process of the Workpiece.

The deburring apparatus of Allmang et al was improved in US Patent No. 3 231 431 of Allmang by the addition of an elongated baffle strip of an approximate half-inch (1/2 '') length arranged approximately a quarter (1/4 '') inch below the oxygen groove to prevent aspiration of ambient air into the oxygen stream, as disclosed in Column 2, Lines 34-72, and in Column 3, Lines 1-13 of the same. As stated in Column 2, Lines 61-65 of Allmang , it was believed that a limiting action caused by the baffle strips on both sides of the oxygen and fuel mixture prevented the aspiration of atmospheric air with oxygen at an adjacent point to each row of preheating (gas outlet) ports.

While the Allmang patent represents an improvement in the state of the art, there is still a need for an improved deburring apparatus that can more consistently produce a smooth deburring surface of the metal workpiece. To achieve this goal, the Showalter et al lower preheating block assembly developed in US Patent No. 5 497 976 was developed. Showalter achieved a smooth surface deburring by providing a lower preheating block assembly for use in a thermochemical deburring apparatus which comprised an improved fuel gas delivery system so that it evenly distributed a stream of combustible gas across the entire width of the metal workpiece, and which protected the flow of oxidizing gas to ensure that the peaks and valleys that result from the use of first known deburring devices were minimized. This was achieved by providing a two-piece lower preheating block assembly having a base or block member, and an insurable extension thereto in a way that could be released by engagement and overlap in relation to the front face of the block. An elongated gas discharge groove was machined within the extension, a groove that communicated with a series of spaced gas discharge ports defined inside and extending longitudinally through the front face of the block. The extension also comprises internal baffles to cause turbulence in the flow of the fuel gas to ensure complete mixing of the fuel gas, such that the fuel gas can be emitted through the gas discharge slots as a uniform flow through of the face of the prolongation.

The lower preheating block assembly of Showalter et al represented a significant advance in the state of the art, but required that a two-piece lower preheating block assembly be manufactured in which a precision machined groove inside is required of the extension, and which also requires the use of internal baffles to cause turbulence in the flow of fuel gas to ensure that the fuel gas is distributed evenly across the width of the extension to prevent ambient air from being aspirated with the flow of oxidizing gas / oxygen as it happened between the upper and lower preheating block assemblies, and to direct it towards the metallic object or workpiece to be thermically chemically deburred.

What is necessary, therefore, but apparently not available in the state of the art is a improved lower preheating block assembly for use with a thermochemical deburring device which is Simple design and manufacturing, and which ensures that the flow Laminar fuel gas is produced to protect the flow of oxidizing gas

In the lower preheating block assembly of Showalter et al , the disclosed gas discharge groove is otherwise arranged within a conventional extension having a deflector similar to that disclosed in Allmang US Patent No. 3 231 431, of such so that the fuel gas discharge groove has to be made plugged or clogged at any point along its length, there is a likelihood that air from the environment will be allowed to be aspirated with the flow of oxidizing gas, which can lead to formation of peaks and valleys during the deburring process. What is necessary, therefore, is an improved lower preheating block assembly for use in a deburring apparatus in which a gas discharge outlet that is less likely to clog is defined within the modular base or of the block, and with which the extension can be placed in an embedded and superimposed position such that it defines a gas discharge orifice of a desired size on the face of the block to simplify the manufacturing of the lower preheating block assembly, and to allow fuel gas to be distributed regularly across the width of the lower block assembly so that the lower block complies satisfactorily the same if there are seals or obstructions in the gas discharge outlets to protect the flow of oxidizing gas from the ambient air during the deburring process.

Finally, while the Allmang patent baffle proves to be useful in minimizing the aspiration of ambient air into the oxidizing gas flow, this problem still persists, even with the improved lower preheating block assembly of Showalter et al . Consequently, what is needed is an improved lower preheating block assembly for use with a thermochemical deburring apparatus which is constructed to use the flow of oxidizing gas as if it were passing over the lower preheating block assembly for pneumatically compressing, or squeeze, the combustible gas between the oxidizing gas flow and the lower preheating block assembly such that the combustible gas is distributed evenly across the width of the lower preheating block, and so that it forms a combustible gas flow laminate which protects and adheres to the flow of oxidizing gas when it continues towards the metal workpiece to be deburred so that it minimizes the probability that peaks and valleys will form during the deburring process, and to improve the yields of Production during metal finishing processes.

Summary of the Invention

Aspects of the present invention are set forth in independent claims. Several features Preferred and optional of the present invention are set forth in the dependent claims.

The present invention provides a set of improved lower preheating block for use in a thermochemical deburring machine which surpasses some of the design deficiencies of the other sets of the block Lower preheating known in the state of the art. The lower preheating block assembly of this invention provides a simple, efficient and highly flexible device for that evenly distributes a combustible gas through the width of a lower preheating block assembly, and to form the combustible gas within a gas flow laminar fuel that adds and protects an oxidizing gas flow passing over the preheat block assembly bottom and along a flow guidance path to the metal object, or work piece, to be deburred thermochemically during the steel finishing process. The relative simplicity of this improved lower block assembly compared to known lower block assemblies allows a greater degree of reliability in the protection of the flow of oxidizing gas, and in maintaining its flow characteristics laminate along the flow path to minimize the formation of peaks and valleys on the surface of the pieces of metal work that are thermochemically deburred with the deburring apparatus.

This invention achieves this high degree of flexibility, maintainability, reliability, as well as simplicity in design and operation, providing a block set preheating system for use with the appliance thermochemical deburring comprising a modular block that has opposite upper and lower faces, extreme faces opposite, and opposite front and back faces that extend between the ends of the faces in a longitudinal direction. There is defined a gas discharge outlet inside of, and extended longitudinally through the front face of the block. A modular extension is embedded in, and partially superimposed on the front face of the block. The extension can partially cover the gas discharge outlet to define a gas discharge port in communication with the outlet of gas discharge on the front face of the block, as desired. The extension is built and arranged to be secured so which can be released on the front face of the block. A characteristic of this construction is that the block assembly of Lower preheating of this invention does not therefore require the manufacture of a groove or gas discharge hole precisely machined fuel in this one and that is less susceptible to dirt or other obstructions that dirty the gas discharge outlet, which can in turn prevent the fuel gas distribution evenly throughout the assembly  of lower block. This therefore minimizes the probability of interruptions in the flow of oxidizing gas, and allows for a lower preheating block assembly that is simple to manufacture, and provides greater production efficiency when used.

The extension has a superior face separated and an opposite lower face, opposite extreme faces, and opposite front and rear faces that extend between the faces extreme in a longitudinal direction. The back side of the prolongation is placed with a relationship that overlaps on the front face of the block. The upper face of the extension is lowered with respect to, for example if placed below, the level of the upper face of the block in such a way that the prolongation is reduced by a predetermined height from The upper face of the block. The extension also includes a guided edge spaced from the front face of the block which extends longitudinally along the length of the extension. The leading edge of the extension may be lowered with respect to the front face of the extension so that form a notch to protect, or protect, the guiding edge with the front face of the extension.

The preheat block assembly The lower part of this invention is intended to be used in a conventional thermochemical deburring apparatus in which there are arranged a top preheat block assembly, the preheating block assembly being distanced lower than and opposite the upper block assembly in such a way that an oxygen groove is defined by and between the two sets of blocks, and through which oxygen is passed and form in a stream of oxidizing gas that moves along a flow path that extends to the workpiece metal that has to be deburred. In an unknown way until now in the state of the art, the only construction of the lower preheating block assembly of this invention makes use of the expansion of the oxidizing gas flow to compress "pneumatically" or squeeze the combustible gas between the flow of  oxidizing gas, the front face of the modular block, and the second face upper arranged in the extension along the dimension longitudinal of the lower preheating block assembly, for example, across the width of the workpiece that is is deburring, to ensure that the combustible gas is evenly distributed substantially throughout the entire longitudinal extension of the front face of the block assembly lower preheating, and to pass the combustible gas compressed and now distributed as a flow substantially uniform and laminate through a pneumatic groove formed by and between the flow of oxidizing gas and the leading edge of the prolongation to ensure that the flow of combustible gas laminar overlaps and adjoins the flow of oxidizing laminar gas so that they both flow together along the path of the flow to the metal workpiece that is deburred. The Unique construction of this preheat block assembly bottom thus provides for uniform gas distribution fuel across the width of the oxidizing gas flow to greatly minimize the likelihood of ambient air intake with the flow of oxidizing gas, and is built to maintain a flow of soft laminating oxidizing gas that moves towards the workpiece elaborate so that a smoother deburring surface of the work piece, resulting in yields of production and manufacturing efficiencies greater than with known deburring devices.

The preheat block assembly improved bottom of this invention, therefore, also gives as result a new method of protection of the flow of oxidizing gas of a thermochemical deburring machine during use, method comprising the steps of the passage of the oxidizing gas flow laminate above the top surface of the modular base or block of the lower preheating block assembly; of the discharge of combustible gas from the discharge outlet of the defined fuel gas on the front face of the block that borders with a first face of it so that it forms a gas flow laminar fuel that supports the flow of oxidizing gas; what comprises the flow of laminar fuel gas between the front face and a second upper face formed in the extension of the set Preheating block bottom with oxidizing gas flow such that the flow of laminar fuel gas is substantially and uniformly distributed below the gas flow laminar oxidant, where the two laminar gas flows pass together along the flow path to the piece of work to be deburred, protecting the flow of laminar gas the Laminar oxidizing gas flow from ambient air to allow deburring a smooth surface of the workpiece metal without the peaks and valleys caused by the air of environment that is allowed to aspirate with the flow of oxidizing gas.

The fuel gas formation stage inside of the laminar fuel gas flow also comprises the stage of pneumatically press the combustible gas against the front face of the block, the upper face of the extension, and the gas flow oxidizer, and the combustible gas passes through a slot pneumatic defined by the flow of oxidizing gas and a guiding edge which extends the longitudinal dimension of the upper face of the prolongation to form the combustible gas within the gas flow laminar fuel that borders the flow of oxidizing gas.

It is, therefore, an object of the present invention providing a preheat block assembly improved bottom for use in a deburring device metal which will reliably and consistently produce a surface soft deburring on a metal workpiece that is deburred thermochemically with this one.

Another objective of the present invention is that of provide a lower preheat block assembly improved for use in a metal deburring device the which is of simple design and construction, is robust and durable at use, and is easy to use and maintain.

Another object of the present invention is that of provide a lower preheat block assembly improved for use in a metal deburring device the which minimizes the likelihood of breathing in ambient air with the oxidizing gas flow, and to form a gas flow laminar fuel that borders the flow of oxidizing gas to protect the flow of oxidizing gas during the deburring process thermochemical

It's these objects, as well as the other objects, characteristics, and advantages of the present invention, which are they will make patents with the reading of the specifications, when taken in conjunction with the accompanying drawings, which are He directs the invention.

Brief description of the drawings

Figure 1 is a partially sectioned view, in schematic side elevation of a deburring apparatus in which the improved lower preheating block of the present invention is arranged to preheat a steel pallet before the beginning of a deburring operation thermochemical

Figure 2 is a front perspective view exploded from a first embodiment of the block of lower preheating of the invention.

Figure 3 is a partial elevation view sectioned side of the preheating block embodiment bottom of figure 2, in which a notch is defined along the leading edge of its extension.

Figure 4 is a perspective view. exploded from a second embodiment of the block of lower preheating of the invention.

Figure 5 is a partial elevation view sectioned side of the lower preheating block of the Figure 4, in which a notch is defined along the edge of guiding the extension of this one.

Figure 6 is a partial elevation view front of the preheating block of figure 4.

Figure 7 is a perspective view exploded from a third embodiment of the block of lower preheating of the invention.

Figure 8 is a partial elevation view sectioned side of the lower preheating block of the Figure 7, in which there is a notch in the guiding edge of its extension.

Figure 9 is a perspective view of a fourth embodiment of the lower preheating block of the invention, in which the block is made of only one piece.

Figure 10 is a partial elevational view sectioned side of the lower preheating block of the figure 9.

Figure 11 is a schematic illustration Part of the lower preheating block of Figures 2 a 6 in use with a thermochemical deburring apparatus, illustrating the formation of the pneumatic groove through the flow of oxidizing gas that passes both above the lower preheating block, and of the laminar fuel gas flow formed by it which is extends below and that borders the flow of oxidizing gas when moves along a flow guidance path to the metal work piece that burrs.

Detailed description of the preferred embodiments

Referring now to the drawings in detail, in which the same reference characters indicate the same parts through the various views, a thermochemical deburring apparatus (5) is illustrated in Figure 1. The deburring apparatus (5) comprises a manifold tube and header assembly (6) constructed in a known manner, the manifold tube and header assembly being constructed and arranged to receive and mount an upper preheat block assembly (7), and a spaced, block assembly Opposite lower preheating (9). The deburring apparatus also comprises, in a known manner, a travel shoe (10) fixed to the manifold tube and the header assembly, the travel shoe having a lower surface (11) in which at least one skate is formed (13). The travel shoe and the skates are arranged in such a way that a metal workpiece, for example a steel pallet, referred to by the reference character "S" in Figure 1, is advanced along the travel path past the deburring apparatus, the multiple tube and the head assembly can be moved in position such that the skates (13) of the travel shoe fit and mount on a respective one of the upper, lower or lateral surfaces of the pallet of steel, each of which respectively, will be provided with a separate deburring apparatus constructed in a similar, but identical manner, to the construction of the deburring apparatus (5) of Figure 1. The deburring apparatus (5) as shown in figure 1 is an upper deburring apparatus with respect to the steel pallet as it advances along the path along the path. The construction of the deburring apparatus (5), and more particularly the construction of the multiple tube and the header assembly (6) is described in more detail in US Patent No. 5 234 658 issued by Showalter et al .

Built in such a way, the multiple tube and the header assembly (6) comprises a first oxygen line (14) through which oxygen under pressure, used as the gas oxidant in the thermochemical deburring operation, supplied to from an illustrated oxygen supply source schematically in figure 1, it is passed to the set of upper preheating (7). A second supply line of oxygen (15) supplies oxygen to an oxygen slot (16) formed by and between the two sets of blocks of upper and lower preheating, respectively, of such so that oxygen is formed within an oxidizing gas flow laminate (82) (see Figures 1 and 11) and pass between the two sets of preheating blocks, and extends along of a flow path, as noted with the character of reference "F" in figure 1, guided towards the palastro of steel or other metal workpiece to be deburred. The tube multiple and the header set also comprises a line of water supply (19), which is supplied with water from from a schematically illustrated water supply source, to upper preheating block assembly (7), and a line water return (21) such that the cooling water can circulate through the preheat block assembly superior in a known way. In a similar way, the tube multiple and the header assembly (6) also comprises a second water supply line (22) which provides water cooling to lower preheating block assembly  (9), with a second water return line (23) in such a way that the cooling water can circulate through the whole of preheating block in a known way.

The upper preheat assembly (7) is best illustrated in figure 1, and shown to have a modular base member or upper block (25), with a upper extension (26) embedded in it in relation superimposed The block (25) is secured to a mounting face (not illustrated) defined in the multiple tube and header assembly by a suitable fixative (27), while prolongation upper (26) is fixed to the upper block (25) by a fixative adequate (29). The fasteners (27) and (29) may comprise, by example, threaded bolts, or machine screws.

An internal water passage (30) is defined within the upper extension (26), in a known manner, in communication with a water supply line (19), and a water discharge line (21) so that The cooling water can circulate through them. There is defined a first internal oxygen passage (31), or multiple tube inside the upper extension, and extending in the longitudinal direction or along the upper extension to provide oxygen to an oxygen discharge outlet (33 ), or discharge hole, defined inside the upper extension (26). Although only one oxygen discharge outlet (33) is shown in Figure 1, it is anticipated that a spaced series of such discharge outputs will be defined along the length of the upper extension as described in more detail in the patents. No. 5 358 221 and 5 472 175 of Showalter et al . The oxygen passage (31) is in communication with the oxygen supply line (14).

Referring still to Figure 1, the upper extension (26) comprises a second oxygen passage (34), or multiple tube, defined therein and extending longitudinally along the length of the extension with respect to the width of the steel pallet that advances along the path towards and past the deburring apparatus of such a motorcycle that in this case, the steel pallet is deburred through its entire upper surface by the deburring apparatus (5 ). The oxygen passage (34) is also in communication with the oxygen supply line (14), and is placed at the distal end of a set of fuel / oxygen gas nozzles (35) placed inside, and arranged as a part of the upper extension (26). The nozzle assembly (35) is described in greater detail in the two aforementioned Showalter et al. Patents, as well as in US Pat.
No. 5 333 841, from Showalter et al . Consequently, the upper extension (26) thus comprises an internal passage of combustible gas (37), or multiple pipe, which extends longitudinally along the length of the upper extension, and which is in communication with the nozzle assembly (35) by means of its proximal and distal ends. The proximal end of the nozzle (35) is positioned at the same level as the front face of the upper extension (26), so that a central oxygen, or oxidizing gas flow is emitted therefrom with a fuel gas flow surrounding it to protect the flow of oxidizing gas.

The upper block (25) and the extension upper (26) will each be formed from a material appropriate and durable metal, such as a bronze material or copper, and more preferably copper.

A first embodiment of the block assembly of Lower preheating (9) is illustrated in Figures 1 to 3, in which the lower preheat block assembly comprises a lower modular base member or lower block (38), and a modular lower extension (39) which fits in, and  it overlaps at least partially to the lower block (38). The lower block (38) is secured to the multiple tube and the assembly of header (6) so that it can be released by a fixation or fixings (not illustrated), and the lower extension (39) are can ensure that the lower block can be released (38) if desired (see Figures 2 to 5) or, alternatively, the lower extension may be formed as a part of the block lower so that the lower block and the extension they comprise a single metal block as shown in figures 9 and 10. The lower block (38) and the lower extension (39) they are each formed of an appropriate metallic material and durable, for example bronze or copper, and preferably of copper

Referring now to Figures 2 and 3, a first embodiment of two pieces of the lower preheating block assembly (9) is illustrated. The lower block (38) comprises a flat upper face (41), an opposite lower face (42), opposite extreme faces (43) and (45), which border the upper and lower faces along their common edges , with a front face (46) and an opposite rear face (47) extending longitudinally in a direction along the lower preheating block (38) between the end faces (43) and (45). An internal water supply passage (49) is defined inside the block (38), and extends from the rear face (47) to and through the front face (46). The internal water supply passage (49) will be in communication with the water supply line (22) illustrated in Figure 1. In a known manner, and as disclosed in US Patent No. 5,497,976, to Showalter et al , a concentric annular groove (50) is located around the opening of the internal water supply passage (49), defined on the front face (46) of the lower preheating block, to accommodate a suitable O-ring (53) (see Figure 3) for the purpose of sealing the internal water supply passage in the extension (39). A water return passage (51) inside the lower block (38) is also defined, and extends from the front face (46) to and through the rear face (47), and is in communication with the water discharge line (23) of Figure 1. As with the internal water supply passage (49) defined in the lower block, a circular groove (52) circumscribes the opening formed in the front face (46) by the water return passage (51) to accommodate an O-ring (53) (see Figure 3) in it to seal the passage (38) between the block and the extension.

As best shown in Figure 1, and as disclosed in greater detail in US Patent No.
5 497 976 of Showalter et al , a spaced series of gas supply conduits (54), of which only one of them is shown in Figure 1, extends from the rear face (47) towards, and in communication with a perforation (55) which serves as a multiple gas tube, defined longitudinally inside the lower block (38). Each of the respective gas supply conduits (54) is in communication with the fuel gas supply line (18) illustrated in Figure 1, or with its suitable equivalent. Although not illustrated in detail, an elongated bar (55 ') with a series of transverse annular discs spaced along its length is passed through the inside of the borehole to form an appropriate number of fuel gas supply chambers in the inside of the perforation such that the combustible gas will be mixed turbulently and will pass as a substantially uniform flow through a gas discharge outlet (56). The construction of an elongated bar like this and a spacer disc device is described in US Patent No. 2 838 431 to Allmang . Referring now to Figure 2, the gas discharge outlet is defined herein as a gas discharge outlet in the form of an elongated groove (56) extending longitudinally inside the front face (46) of the preheating block bottom (38), and which extends into the block in such a way that it is in communication with the perforation (55) to be fed with the combustible gas from it.

The preheat block assembly Bottom (9) of Figure 2 also comprises an extension separate bottom (39) which is built and arranged to be secured to the front face of the lower block so that it can release in a lace and with a partially relationship superimposed The lower extension (39) generally presents a flat upper face (58) with an opposite lower face (59), a pair of spaced end faces (60) and (62) that border on the upper and lower faces of the extension along their common edges, with a front face (63) and a back face opposite (64) extending in the longitudinal direction to what along the extension, and that borders the upper faces, inferior, and extremes of these along their common edges. As best shown in Figures 1 and 3, a elongated perforation or water passage (66) inside the prolongation along its longitudinal direction, and is in communication with a water supply conduit (67) in each of its ends, two such ducts being defined water supply spaced inside the extension, one of each of the supply ducts being in communication of water with any of the two internal feeding steps of water (49), or water discharge passage (51), respectively, defined inside the lower block (38).

In the configuration of two pieces of the set of lower block (9) shown in figures 1 to 8 and 11, the lower extension (39) is fixed to the lower block (38) by passing a threaded fastener (not illustrated) through of one of the three spaced openings (not illustrated) defined on the rear face (47) of the lower block and extending longitudinally through these and through one of the three spaced openings (68) defined on the front face (46) of this, and in a respective of the three spaced threaded openings  (not illustrated) defined inside the rear face (63) of  the lower extension, in a known manner, such that the Lower extension is secured to the front face of the block bottom in a way that can be released. Lower extension (39) also comprises, in a known manner, at least one, in this case two, guide bushings (not illustrated) spaced apart between yes, each of which extends laterally from the face rear (64) of the extension and is sized and formed to be received inside one of the respective perforations (69) defined inside the front face of the block bottom, for guidance and extension alignment bottom of the bottom block.

As shown in Figures 1 and 3, and in a way unknown in the prior art, in this two-piece configuration the block (38) and the extension (39) are constructed in such a way that the extension is Secures the block so that it can be released, the upper face (58) of the latter will cross the gas discharge outlet (56) defined inside the front face of the block such that the extension will define a discharge orifice of gas (70) in communication with the gas discharge outlet (56). An advantage of this construction is that the gas discharge outlet (56), here a groove, can be manufactured of a large size with great ease, and with a lower cost, during the manufacture of the block, instead of manufacturing a groove precision as shown in the extension of the lower preheating block assembly of Showalter et al , in US Patent No. 5,497,976.

As is known to those skilled in the art, a combustible gas is emitted through the lower preheating block assembly (9) in order to protect the flow of laminar oxidizing gas (82) (see Figures 1, 11) which is generated by passing oxygen through the slot (16) defined by and between the upper and lower preheating block assemblies. If ambient air is allowed to be aspirated, for example, mixed with and creating turbulence inside the oxidizing gas flow, the likelihood of undesirable peaks and valleys occurring when the surface of the metal workpiece is deburred, in such a way that a greater amount of the outer surface of the metal workpiece has to be deburred to arrive at a smooth deburred surface, which has the undesirable effect that it decreases production yields. In the deburring apparatus of US Patent No. 5 497 976 of Showalter et al , the lower preheating block assembly is constructed and arranged such that a substantially uniform flow of combustible gas along the longitudinal dimension is obtained, for example, width of the object to be deburred, so that it protects the flow of oxidizing gas, and so that it minimizes the perspective of peaks and valleys that form on its surface to reach a smooth deburred surface.

This requires, however, the precise machining of the groove inside the extension of the lower preheating block assembly of Showalter et al , as well as the machining of internal baffles inside the extension, and / or of the lower block of the preheating block assembly to ensure turbulent mixing of the combustible gas, such that the flow of combustible gas is distributed evenly along the length of the extension so as to protect the flow of oxidizing gas from ambient air. If any opening inside the protective fuel gas is allowed to occur, it turns out, for example, that a part of the groove is blocked or blocked in any other way, the likelihood of these "breaks" occurring in the protection of the which will allow the ambient air that will be aspirated to increase with the flow of oxidizing gas. Although this device by Showalter et al , has proven to be a significant improvement in the state of the art, the invention disclosed here eliminates the need for precision machining of a groove inside the extension, while machining a wider or otherwise formed groove inside the front face of the lower block (38), and the extension (39) is used to define a hole in the front face of the block such that the preheat block assembly it has to be easier to manufacture, and it has to be easier to maintain having the extension to be damaged during the deburring operation, for example it has to be attacked by molten metal and if the extension is not damaged, where the extension can be Quickly and easily replaced at minimal cost, instead of having to replace a precision machined extension.

As shown in figure 3, the back face (64) of the extension (39) is fitted on the front face (46) of the lower preheating block (38) in such a way that the respective water supply conduits in (67) are aligned with the respective water passages (49) and (51) defined inside the lower preheating block, and so that the o-rings (53) placed inside their respective slots (51, 52) are compressed to seal the water supply ducts on the rear face of the extension. When this occurs, and as described more above, the upper face (58) of the extension forms the hole gas discharge (70) of the lower preheating block (38).

In Figure 2, a guide edge is illustrated (71) which extends along the length of the lower extension (39) where the upper face (58) and the face front (63) join each other. However, as the lower preheating block assembly (9) will be placed as close to the metal workpiece to be deburred as it allow the upper preheat block assembly, it is desirable to protect the guiding edge from prolongation, with the purposes that will be described in more detail below. In consequence, and as shown in figure 3, an elongated notch (72) extending over the length of the lower extension (39) can be defined within it for the purpose of that lowers the guide edge (71) with respect to the front face  (63) of the extension so that the front face of the extension is used to shield or protect the edge of  guided. Again, and as described above, a feature of the construction of two pieces of the block assembly lower preheating (9) is that if the extension (39) it is damaged during the deburring process, it can be quick and easily removed and replaced in the lower block (38).

A second embodiment of the block assembly of Lower preheating (9) is illustrated in Figures 4 to 6. The lower preheating block (38) of Figure 4 is constructed identically to the lower preheat block (38) of Figure 2, with the exception that instead of arrange an elongated continuous groove as a gas discharge outlet   (56) (see Figure 1), a series of openings are defined circular spaced and aligned (56 ') inside the face front of the lower preheating block (38), as outputs gas discharge; each of which extends to the inside the block and in communication with the perforation (55), also defined in this one. The lower extension (39) of the Figure 4 is constructed identically to the extension bottom (39) of figure 2, and therefore not described with more detail

As illustrated in Figures 2 and 3 with the realization of a lower preheating block assembly (9), the lower preheating block assembly of the Figures 4 to 6 is a set of two pieces in which the extension (39) is secured in a way that can be released, and partially overlaps the front face of the lower block (38). Referring to Figure 5, therefore, the extension (39) in this second embodiment of the preheating block assembly lower defines a gas discharge orifice (70), or in this case a series of spaced gas discharge holes (70) (see Figure 6) that extend longitudinally through the front face (46) of the lower preheating block. A Again, one feature of this construction is that it is relatively simple and easy to drill a drilling of a eighth of an inch, for example, inside the front face of the lower block (38), and then dimension the holes of gas discharge (70), as desired, based on the length of the rear face (64) of the extension (39) that overlaps the front face (46) of the block (38).

As shown in Figure 6, therefore, the result of the extension (39) being fitted in and partially overlapping the front face and gas discharge outlets (56 ') is that a series of openings is defined semi-circular spaced in the extension, each one of which serves as a gas discharge orifice (70). Also, as shown in Figure 5, an elongated notch (72) it can be defined inside of, and extending along the length of the guide edge (71) of the upper face of the prolongation such that the leading edge, and the upper face, are protected, respectively, by the front face (63) of the set during the deburring process.

A third embodiment of the block assembly of Lower preheating (9) is illustrated in Figures 7 and 8. A Again, the lower block (38) is constructed identically to the lower blocks (38) of figures 2 and 4, with the except that each of the circular openings (56 ') defined on the front face (46) of the lower block (38) presents an insert (57), preferably a mechanized insert of copper, formed to be entering as a sheath inside the respective of the circular openings (56 '), and presenting a internal passage defined in these as gas discharge hole (70), and that extends through them in communication with the perforation (55) defined in the lower block (38). In this realization of the lower preheating block assembly, however, it is shown in figure 8 that although the prolongation (39) is secured to the lower block (38) in a way that can be release, the prolongation here does not partially overlap and define a gas discharge hole inside the front face of the lower block while the gas discharge hole (70) is defined by the central passage or perforation defined in the inside of, and extending through, each of the inserts  (57).

A characteristic of the construction of the lower preheating block assembly (9) of the figures 7 and 8, therefore, is that the circular openings (56 ') defined inside the front face of the lower block is they can be large with respect to machining in the inside the lower block (38) of figure 4, such that the openings are relatively fast and easy to form, in where an insert that has a precisely drilled passage, by example a step that is one tenth of an inch or nine hundredths inch in diameter that extends through it, is arranged so that it emits the combustible gas through it during the deburring process. However, and if desired, it is anticipated that a lower extension (39) could partially cover the inserts (57) and could form the gas discharge hole (70) defined by the perforations drilled inside each one of the respective inserts.

As shown in Figure 8, the extension lower (39) has a leading edge (71) that extends to along its length where the upper face (58) and the face front (63) join each other, and can also be arranged with a notch (72) to lower the guiding edge with respect to the front face (63) of the extension with the purpose of shielding and / or protecting the guiding edge of damage during the deburring process for reasons described with More detail below.

A fourth embodiment of a block assembly Lower preheating (9) is illustrated in Figures 9 and 10, in which a preheating block assembly is arranged of a modular piece. The preheat block assembly bottom (9) of figure 9 thus comprises a lower block (38 ') having a substantially flat upper surface (41), an opposite lower face (42), a pair of spacings and opposite spaced ends (43) and (45) that extend to the along the common edges of the upper and lower faces, a rear face (47) extending in the longitudinal direction of the block from the extreme face (43) to the extreme face (45) and that join the upper and lower faces of these along their common edges, and an integral lower extension (39 ') formed as a part of the block (38 '). The prolongation (39 ') it has an upper face (58) which is lowered a height default from, and with respect to, the upper face (41) of the block (38 '). The upper face (58) is also found substantially parallel to the upper face (41). Prolongation (39 ') has a lower face (59) opposite and distant from the upper face (58), and a pair of opposite end faces and spaced (60) and (62), the extension (39 ') also presents a front face (63) extending in the direction longitudinal / along it, between the extreme faces (60) and (62), and bordering the upper face (58) along the edge of guidance (71) that extends along the extension.

As with the realization of the block assembly of lower preheating illustrated in figures 7 and 8, the block  (38 ') is provided with a series of openings (56') aligned and defined spacings inside the front face (46) of this one and that extends into the communication block with perforation (55). Each of the openings (56 ') presents one of the respective inserts (57), which are described with greater detail above, welcomed in these, so that the inserts define the respective gas discharge orifices (70) through of the front face of the lower block (38 ').

As best shown in Figure 10, in this realization of the lower preheating block assembly a perforation (66) is defined once again inside the extension (39 ') so that the cooling water can circulate through it, the perforation presenting a conduit of water supply (67 ') formed at their respective ends adjacent to the extreme faces (43), (45), (60) and (62), respectively, which extend towards and opening in the face rear (47) of the block (38 '), each of the two ducts of respective water supply (67 ') that are in communication with either of the two water supply lines (22) (see the figure 1) or water discharge line (23) (see figure 1), respectively.

In both embodiments of two pieces of the set of lower preheating block (9) illustrated in the figures 1 to 8, and in the realization of a piece illustrated in the Figures 9 and 10, the lower blocks (38), (38 ') and the lower extensions (39), (39 ') will consist each of a metallic material, preferably bronze or copper, and more preferably copper. Also, although a slot is shown elongated (56) as a gas discharge outlet in the realization of the invention shown in figure 2, a series of openings Spaced circular (56) are shown as the discharge outputs  of gas in the embodiment of the invention illustrated in Figure 4, and a series of spaced openings (56 ') with a respective of the inserts (57) arranged therein form the outputs of gas discharge and holes in the embodiments of the invention shown in figures 7 and 9, it is anticipated that it can be have any desired type of gas discharge outlet and / or  combination of holes, as desired. For example, and if you want, each of the respective openings (56) or (56 ') in the Figures 4, 7 and 9 can be arranged with one of the respective sets of fuel / oxygen gas nozzles (35) illustrated in Figure 1. The respective constructions of the outputs of gas discharge, and the holes illustrated in figures 1 through 10, therefore, should be considered as illustrative, and not limiting

Functioning

The construction of the block assembly Lower preheating (9) of Figures 1 to 10 allows for the protection of, for example, the shield, from the gas flow oxidizer formed by the oxygen that passes through the groove (16) (see Figure 1) during the deburring process of a previously unknown form in the state of the art, and with results so far never achieved by known sets of the lower preheating blocks.

As is known by those who are experts in matter, if a compressed or pressurized gas, for example oxygen, it passes through a hole, just like a hole (81) formed at the end of an oxygen slot (16) in the figures 1 and 11, the gas will be intended to expand as progresses along the path of the flow by which it is known as the expansion angle included. Typically, the angle of expansion included will be approximately 14º as measured by the angle named by the reference character "A" in Figure 11. The construction of the block assembly of lower preheating of this invention, and in particular the prolongation of this, takes advantage of this gas expansion to allow for the formation of a flow of combustible gas laminate which overlaps and borders, and thus protects, the flow of oxygen gas when it passes along the flow path towards the metal workpiece to be deburred.

As best shown in Figures 1 and 11, by therefore, the flow of oxygen gas passing through the slot (16) and which is emitted from the hole (81) takes the form of a flow of laminar oxidizing gas (82) that extends along the flow guidance path to the metal workpiece Metallic to be deburred. As shown in Figure 11, the flow  of oxidizing gas has a tendency to expand to the angle of expansion included A, which in turn creates a pneumatic chamber (88) defined by the exposed face (86) along the face front (46) of the lower block (38), the upper face (58) of the prolongation, and the flow of oxidizing gas (82). Exposed face  (86) is that part of the front face (46) of the lower block that is left exposed once the extension (39) is fitted in and superimposed on the front face of the lower block. When a combustible gas (85) is emitted through the gas discharge outlet (56), (56 '), and in such case through the discharge hole of gas (70), the flow of oxidizing gas acts to compress pneumatically and squeeze the combustible gas so that it Distributes substantially and evenly across the exposed face along the longitudinal dimension, for example, through the width of the flow of oxidizing gas inside the chamber pneumatic (88).

The extension (39), and more particularly the upper face (58) and the guide edge (71) thereof, are built in such a way that they extend in the direction downstream of the flow path, but nevertheless ends before the point where the flow of oxidizing gas intercepts the leading edge (71) of the upper face, such so that the oxidizing gas stream (82) and the guiding edge (71) form a pneumatic groove (89) in communication with the camera  (88), which allows the now evenly distributed gas fuel, which has been protected inside the chamber (88) of the aspiration of ambient air, to pass through the slot as a flow of laminar fuel gas (90) which underlies and adjoins the flow of oxidizing gas, and flows with the flow of oxidizing gas along the flow path to the metal workpiece to be deburred, thus protecting fast, efficiently, and economically the flow of oxidizing gas without the Need for a precision machined gas discharge groove and / or baffle / mixing chambers inside the extension.

It is anticipated that with known types of lower preheating blocks and deburring machines manufactured by ESAB Welding and Cutting Products of Florence, South Carolina, for example, in which the upper face (58) is is about a quarter of an inch below the face upper (41), than the upper face (58) of the extension (39), it will extend beyond the front face (46) of the lower block (38), (38 '), respectively, up to a length in the range a from five eighths of an inch to about one inch and quarter in length. This relationship, described in a way different, it is usually that where the upper face (58) of the extension (39) separates below the upper face (41) of the lower block (38) at a predetermined distance, by example the distance that is highlighted between the two faces respective upper, the upper face of the extension is extend forward from the front face of the block lower in a distance between 2.5 and 5 times the height default

Regardless of size, it is anticipated that the upper face (58) will not extend beyond in the direction of the oxidizing gas flow along the flow path of so that it will cross the flow of oxidizing gas. If the leading edge (71) crosses the flow of oxidizing gas, the pneumatic groove (89) is not  will form, and this will allow ambient air to be sucked in with the flow of oxidizing gas and that creates the undesirable effect of inducing turbulence, and thus ripples in the gas flow oxidizing

The length of the upper face (58) that is extends in the direction of the gas flow path oxidizer can also be expressed with respect to the angle of expansion A, this will be defined as the hypotenuse of a triangle formed with the exposed face (86) of the lower block (38), and the upper face (58) of the extension. If, for example, the angle of expansion comprised A in Figure 11 is approximately 14th, then using the known geometric relationships, the ratio of the height of the exposed face (86) of the block (38) with with respect to the length of the upper face (58) of the extension (39) will be equal to the tangent of the expansion angle for the two sides of the triangle to cross the hypotenuse, and thus the gas flow oxidizing Thus, it is anticipated that the height ratio of the exposed face (86) with respect to the length of the face higher (58) will be substantially equal to, but less than, the tangent of the expansion angle A such that it will be allowed sufficient space between the flow of oxidizing gas (82) and the edge  of guidance (71) to form the pneumatic groove (89), in communication with the pneumatic chamber (88), and to allow formation of a flow of laminar fuel gas (90) as shown in figures 1 and 11. In a specific example, the angle of expansion A is approximately 14º, the height of the face exposed (86) is about 1/4 inch, and the upper face length (58) is approximately 1 inch.

A method for gas flow formation laminar fuel (90) tested in the block assembly lower preheating (9) thus comprises the steps of that the flow of oxidizing gas (82) passes over the face upper (41) of the lower block (38), (38 ') and above the upper face (58), (58 ') of the extension (39), (39'), respectively, the oxidant gas flow being distanced from (above) and with respect to the guide edge (71) of the extension; that discharges a combustible gas (85) from a fuel gas discharge outlet (56) placed on one side front (46) of the block assembly that borders the upper face (41), and forming a second flow of laminar fuel gas (90) which overlaps and borders the laminar oxidizing gas of such so that the combustible gas is pneumatically compressed by and between the flow of oxidizing gas and the upper face (58), (58 ') to evenly distribute the combustible gas along the length of the lower preheating block assembly.

The method also comprises the steps of formation of a pneumatic groove (89) between the gas flow laminar oxidant and the leading edge (71) of the upper face (58), (58 ') of the extension, substantially extending the groove across the entire longitudinal extension of the face upper (58), (58 '), such that the combustible gas is compresses pneumatically or squeezes through the groove and it form within the flow of laminar fuel gas (90) by means of the Laminar oxidizing gas flow to evenly distribute the fuel gas flow below the oxidizing gas flow when the flow of laminar fuel gas passes through the pneumatic groove As a result of this process, the gas flow laminar fuel overlaps and borders the gas flow oxidizer (82) to protect the flow of oxidizing gas from the aspiration of ambient air to reach a surface softer deburring on the S steel pallet (see figure 1) which passes through the deburring apparatus (5).

Also, as a part of the laminar fuel gas flow formation process, the pneumatic chamber (88) (see Figure 11) is formed by and between the oxidizing gas flow (82), the exposed face (86) of the block lower, and the upper face (58), (58 ') of the extension when the fuel gas is emitted from the discharge outlet of the fuel gas (56) defined inside the front face of the lower block. The pneumatic slot (89) is formed to be in communication with the pneumatic chamber. The upper boundary layer of oxidizing gas flow (82) will be protected by oxygen and the oxygen / gas flow emitted by the upper preheating block assembly (7) in the manner described in several Showalter et al patents, referenced further above.

Although the preferred embodiments of the invention have been set forth in the description above, the subject matter experts will appreciate that they can be done variations and modifications in it without departing from the spirit and scope of the invention, as set forth in the following claims. Additionally, the corresponding structures, materials, actions, and equivalents of all means or steps plus functional elements in the claims attached, they intend to include any structure, material or action to carry out the functions described or claimed in combination with the other claimed elements, as specifically claims herein.

Claims (17)

1. Bottom block assembly (9) for your use in a thermochemical deburring apparatus (5), which understands: a block (38) having upper faces and lower (41, 42) opposite, opposite extreme faces (43, 45), and opposite front and rear faces (46, 47) that are extend between said end faces (43, 45) to define a longitudinal direction that extends between them, an extension (39) extending in a forward direction from said front face (46) of said block (38), and comprising a second upper face (58) which is parallel to said upper face (41) of said block (38), and said second upper face (58) being spaced below of said upper face (41) of said block (38) so that define a predetermined height, and gas discharge outlet means (56, 56 ') arranged to communicate with said front face (46) between said upper face (41) of said block (38) and said second upper face (58), and extending longitudinally through substantially the entire longitudinal extension of the front face (46), such that the gas can be discharged forward from said outlet means (56, 56 ') to form a flow of laminar gas that is extends forward through said second upper face (58); characterized in that: the second face (58) extends forward to from said front face (46) in a distance comprised between about 2.5 and 5 times said predetermined height. 2. Bottom block assembly (9) according to the claim 1, wherein the extension (39) comprises a integral component of said block (38). 3. Bottom block assembly (9) according to the claim 1, wherein the extension (39) comprises a separate component that is fixed to said block (38). 4. Lower block assembly (9) according to the claim 3, wherein the extension (39) is conceived and arranged to be fixed to said block (38) so releasable 5. Lower block assembly (9) according to the claim 3, wherein said discharge discharge means of gas (56, 56 ') comprise one or more outlets formed in said face front (46), and in which said extension (39) overlaps partially to those exits. 6. Bottom block assembly (9) according to the claim 5, wherein said discharge discharge means of Gas (56, 56 ') comprise a single slot that extends longitudinally. 7. Bottom block assembly (9) according to the claim 5, wherein said discharge discharge means of Gas (56, 56 ') comprise a plurality of separate outlets. 8. Lower block assembly (9) according to the claim 1, wherein said extension (39) comprises a part of the guide edge (71) that has a notch that is extends longitudinally (72) in it which communicates with said second upper face (58). 9. Bottom block assembly (9) according to the claim 1, wherein said predetermined height is of about 6.35 mm (1/4 inch) and said second face (58) extends outwardly from said front face in a distance between approximately 15.88 mm (5/8 inch) and 31.75 mm (1 1/4 inch). 10. Thermochemical deburring apparatus (5), which understands: an upper block (7) presenting a face lower, a lower block (9) comprising a block (38) which has opposite upper and lower faces (41, 42), opposite extreme faces (43, 45), and front faces and opposite back (46, 47) that extend between said faces extremes (43, 45) to define a longitudinal direction that extends between them, said lower block being arranged (9) below said upper block (7) so that the face bottom of said upper block and said upper face (41) of said block (38) define an elongated slot (16) through the which first gas can be discharged in the form of a gas flow sheet (82) that moves forward towards a piece of metal work (S) to be deburred, an extension (39) extending in a forward direction from said front face (46) of said block (38), and comprising a second upper face (58) parallel to said upper face (41) of said block (38), being spaced said second upper face (58) below said face upper (41) of said block (38) to define a height default, and gas discharge outlet means (56, 56 ') arranged to communicate with said front face (46) of said block (38) and between said upper face (41) of said block (38) and said second upper face ( 58) of said extension (39), and said outlet means (56, 56 ') which extend longitudinally through substantially the entire longitudinal extension of the front face (46), such that a second gas can be discharged (85) forward from said outlet means (56, 56 ') to form a second flow of laminar gas that moves forward through said second upper face (58), and thereby defining a pneumatic groove (89) between said first laminar gas flow (82) and said second upper face (58) of said extension (39) which serves to compress the second laminar gas flow when it moves forward through the second upper face (58) of the extension (39); characterized in that: the second face (58) extends forward to from said front face (46) in a distance comprised approximately 2.5 to 5 times that height default 11. Deburring device (5) according to claim 10, wherein said first flow of laminar gas (82) describes an expansion angle (A) when the first gas is discharge through said elongated slot (56), and in which the ratio of the length of the predetermined height with respect to the length of said second upper face (58) forward of said extension (39) is substantially equal to the tangent of said expansion angle (A). 12. Deburring device (5) according to claim 10, wherein the bottom face of said block upper covers at least a substantial part of said second upper face (58) of said extension (39). 13. Method of protection of a gas flow oxidizer of a thermochemical deburring process comprising the following stages: to pass a flow of oxidizing laminar gas through a first upper face (41) of a block assembly (9), while discharging a combustible gas by means of a fuel gas outlet (56, 56 ') practiced in a front face (46) block assembly (9) adjacent to said upper face (41) and so that it forms a second flow of laminar fuel gas which is under said flow of laminar oxidizing gas (82), characterized in that the method comprises also the stage of: compress the second flow of combustible gas laminate between a second upper face (58) extending towards front from said front face (46) and the gas flow laminar oxidant (82) to thereby distribute so substantially uniform the second flow of laminar fuel gas below the flow of oxidizing laminar gas (82). 14. Method according to claim 13, which it also includes the stages of forming a pneumatic groove (89) between said flow of laminar oxidizing gas (82) and said second upper face (58), said groove extending (89) longitudinally through substantially the entire extension longitudinal of said second upper face (58), being compressed the combustible gas when it passes through said slot (89) to forming said second flow of laminar fuel gas. 15. Method according to claim 13, which it also comprises the step of arranging said extension (39) in a partial coating ratio of said gas outlet fuel (56, 56 '). 16. Method according to claim 13, wherein the compression stage involves causing the flow of oxidizing gas laminate (82) dilates when it travels through the second upper face (58) to thereby form with the second face upper (58) a pneumatic groove (89) through which the second flow of laminar fuel gas. 17. Method according to claim 16, wherein the flow of laminar oxidizing gas (82) is dilated at an angle default (A), and in which the face height ratio front (46) of the block assembly (9) with respect to the length of the second upper face (58) is substantially equal to the tangent of said predetermined angle (A).